Some time between Mary Cooper (Laurie Metcalf) ordering Sheldon (Jim Parsons) to get dressed to go see Dr. Gablehauser (Mark Harelik), and then going to bed later that night, the comic books on the wall above his bed changed order.
The schmear on Raj's bagel changes from a shapeless lump to an almost perfect scoop between shots.
Sheldon's mother tells the group that the "death ray" he created as a child scared their dog. In Young Sheldon the family never had a dog because Sheldon was terrified of them.
When Sheldon is driving with Penny in the car and says assume the weight of the car as 4000 pounds, his weight as 140 and Penny's as 120, he comes up with the total weight as 4400. It should be 4260 pounds.
Sheldon says there are eight consonants in the Hawaiian alphabet. There are actually only seven; H, K, L, M, N, P, and W.
Sheldon (Jim Parsons)'s 'estimate' of 4,000 pounds for Penny (Kaley Cuoco)'s vehicle is grossly inaccurate. Modern mid-size sedans average 3,200 pounds while her small Volkswagen Golf Cabriolet weighs closer to 1,900-2,100 pounds.
Sheldon states that the eggs are kept refrigerated in the supermarket. A previous editor declared they are not, and should be kept at room temperature when stored at home. However, this appears to be a difference between America and Europe. This is the European theory. This show is set in America, where eggs are indeed refrigerated at the supermarket, and it is a commonly held practice that eggs must be kept refrigerated or they'll go bad quicker.
Sheldon mentions that if he invented a time machine, he would go back in time and give it to himself, thus preventing the need to ever invent it. Because Sheldon believes time travel is a closed loop, he would see this as having created a paradox; Sheldon never invented it in the past to bring it to himself in the future.
After Dr. Gablehauser gestures to the chair and says, "Please," his mouth keeps moving but no words come out. (He probably originally said, "Please sit down.")
In the store, Sheldon tells Penny that tomatoes are actually fruit, not vegetables. Tomatoes are fruit in botanical terms, but they are vegetables in culinary terms. Though there are culinary fruit and vegetables, botanically, there are no vegetables. A lot of vegetables are botanical fruit.
Sheldon starts his lengthy brake distance calculation with an estimation of the weight of the car but the weight does not come into it. The momentum added by extra weight is canceled out by the extra friction it causes on the tires. Which Sheldon would know.